A study of 192Ir production conditions at an electron accelerator

Design of an X -band electron linear accelerator dedicated to decentralized Mo99/TcJang1, Yamamoto2, Uesaka3 2017Phys. Rev. Accel. Beams10020View full textAdd to dashboardCite

“…We were unable to compare our 99 Mo-yield estimate with those of the previous studies [23,[25][26][27]29] for the following reasons: First, at an instant of irradiation time, the bremsstrahlung distribution in a target of enr Mo and hence the 99 Mo yield depend not only on the electron beam energy, but also on the compositions and dimensions of the nat W-enr Mo target assembly, which are not necessarily the same in different studies. Second, the 99 Mo-yield normalization is often inconsistent across studies.…”

“…Second, the 99 Mo-yield normalization is often inconsistent across studies. For instance, some authors [25][26][27] used the masses of involved Mo nuclides, beam power, and irradiation time to express their unit 99 Mo yields, while some, [23,29] including us, used the beam power only. If a standard allowing such comparison is established, more reliable yield estimations can be made in future works.…”

“…On this account, several accelerator-based alternatives to the fission-based 99 Mo= 99m Tc production scheme have been explored, including (1) direct production of 99m Tc via 100 Moðp; 2nÞ 99m Tc using a cyclotron [20,21]; (2) production of 99 Mo via 100 Moðn; 2nÞ 99 Mo using a cyclotron as the neutron source [22]; and (3) production of 99 Mo via 100 Moðγ; nÞ 99 Mo using an electron linear accelerator (linac) as the photon source [7,[23][24][25][26][27][28][29][30]. Among these proposals, we consider the electron-linac method a viable approach for the following reasons.…”

Measured bremsstrahlung photonuclear production of 99Mo (99mTc) with 34 MeV to 1.7 GeV electrons

“…Any evaluation of the merits of a production strategy must include both evaluation of the available accelerator technology, and the subsequent techniques for efficient and high purity 99m Tc extraction and conversion to labeled compounds of medical utility. Photonuclear production has been demonstrated as a viable option, with source photons from Bremsstrahlung (Avagyan 2014, Bennett 1999, Dzhilavyan 2011, Dovbnya 2011, Sabel'nikov 2006, Starovoitova 2014 or Compton sources (Habs 2011). This method would provide a source of 99m Tc (half life 6 hours, the primary decay product from 99 Mo) without the security concerns surrounding high enrichment uranium (HEU) targets, or the need for dedicated nuclear reactor facilities.…”

FORMATION OF MIXED X,n-RADIATION FIELD AT AN ELECTRON ACCELERATOR

“…A promise area of application of the mixed Х,n-radiation with the thermalized spectrum of the neutron component is photonuclear technology of isotope production, in particular, of medical assignment [2]. In work, the possibility to control the radiation flux density and neutron spectrum at an isotopic target by moderator size and electron beam energy is studied by computer simulation on the basis of a GEANT4 code [3].…”